Damp-proof courses

Abstract

Damp walls in buildings are unhealthy and a continual source of trouble. They cause timber to rot, plaster to perish and bulge, paint to blister, and paper to discolour and peel away from the wall surface. It is therefore necessary to prevent the penetration of moisture, by the provision of adequate damp-proof courses, combined with effective construction around openings, in parapets, chimney stacks etc. Materials for damp-proof courses may be classified under three headings: flexible, semi-rigid and rigid.